EP3280172A2 - Procédé et dispositif d'émission et de réception, à l'aide d'un terminal v2x, d'un signal dans un système de communication sans fil - Google Patents

Procédé et dispositif d'émission et de réception, à l'aide d'un terminal v2x, d'un signal dans un système de communication sans fil Download PDF

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EP3280172A2
EP3280172A2 EP16773496.1A EP16773496A EP3280172A2 EP 3280172 A2 EP3280172 A2 EP 3280172A2 EP 16773496 A EP16773496 A EP 16773496A EP 3280172 A2 EP3280172 A2 EP 3280172A2
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Prior art keywords
resource pool
information
transmission
resource
signal
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Granted
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EP16773496.1A
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German (de)
English (en)
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EP3280172A4 (fr
EP3280172B1 (fr
Inventor
Hyukjin Chae
Hanbyul Seo
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LG Electronics Inc
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LG Electronics Inc
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Publication of EP3280172A4 publication Critical patent/EP3280172A4/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0226—Traffic management, e.g. flow control or congestion control based on location or mobility
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H04W64/003—Locating users or terminals or network equipment for network management purposes, e.g. mobility management locating network equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
    • G08G1/0108—Measuring and analyzing of parameters relative to traffic conditions based on the source of data
    • G08G1/012—Measuring and analyzing of parameters relative to traffic conditions based on the source of data from other sources than vehicle or roadside beacons, e.g. mobile networks
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/052—Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/056—Detecting movement of traffic to be counted or controlled with provision for distinguishing direction of travel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/025—Services making use of location information using location based information parameters
    • H04W4/026—Services making use of location information using location based information parameters using orientation information, e.g. compass
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]

Definitions

  • the following description relates to a wireless communication system and, more particularly, to a method of, at a user equipment (UE), transmitting and receiving a vehicle to everything (V2X) related signal, and a device therefor.
  • UE user equipment
  • V2X vehicle to everything
  • a wireless communication system is a multiple access system that supports communication of multiple users by sharing available system resources (a bandwidth, transmission power, etc.) among them.
  • multiple access systems include a Code Division Multiple Access (CDMA) system, a Frequency Division Multiple Access (FDMA) system, a Time Division Multiple Access (TDMA) system, an Orthogonal Frequency Division Multiple Access (OFDMA) system, a Single Carrier Frequency Division Multiple Access (SC-FDMA) system, and a Multi-Carrier Frequency Division Multiple Access (MC-FDMA) system.
  • CDMA Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • MC-FDMA Multi-Carrier Frequency Division Multiple Access
  • D2D communication is a communication scheme in which a direct link is established between User Equipments (UEs) and the UEs exchange voice and data directly with each other without intervention of an evolved Node B (eNB).
  • UEs User Equipments
  • eNB evolved Node B
  • D2D communication may cover UE-to-UE communication and peer-to-peer communication.
  • D2D communication may find its applications in Machine-to-Machine (M2M) communication and Machine Type Communication (MTC).
  • M2M Machine-to-Machine
  • MTC Machine Type Communication
  • D2D communication is under consideration as a solution to the overhead of an eNB caused by rapidly increasing data traffic. For example, since devices exchange data directly with each other without intervention of an eNB by D2D communication, compared to legacy wireless communication, the overhead of a network may be reduced. Further, it is expected that the introduction of D2D communication will reduce the power consumption of devices participating in D2D communication, increase data transmission rates, increase the accommodation capability of a network, distribute load, and extend cell coverage.
  • An object of the present invention is to provide a method of transmitting and receiving a signal for transmitting data after selecting a resource pool in consideration of position information of a vehicle to everything (V2X) UE.
  • the object of the present invention can be achieved by providing a method of, at a user equipment (UE), transmitting and receiving a vehicle to everything (V2X) related signal in a wireless communication system including selecting a resource pool by comparing one or more measurement information with resource pool parameters and transmitting data using the resource pool, wherein the one or more measurement information are related to a geographical position of the UE.
  • UE user equipment
  • V2X vehicle to everything
  • a user equipment (UE) device for transmitting and receiving a vehicle to everything (V2X) related signal in a wireless communication system including a transmission module and a reception module and a processor, wherein the processor selecting a resource pool by comparing one or more measurement information with resource pool parameters and transmits data using the resource pool, and wherein the one or more measurement information are related to a geographical position of the UE.
  • V2X vehicle to everything
  • a range of a value may be configured in the resource pool according to parameters related to the geographical position of the UE.
  • One or more of a transmission period, a transmission probability and a repetition number may be configured in the resource pool.
  • the one or more measurement information may include movement direction information of the UE.
  • the movement direction information of the UE may be measured by a sensor or a global positioning system (GPS) of the UE.
  • GPS global positioning system
  • the movement direction information of the UE may be derived from change in cell ID.
  • the cell ID may be identifier information for identifying a road side unit (RSU).
  • RSU road side unit
  • the one or more measurement information may be an average of movement speeds of UEs located near the UE.
  • the one or more measurement information may include mobility of the UE.
  • the mobility may be measured by a speed sensor of the UE.
  • the mobility may be determined by the number of times of detection of road side units (RSUs) each having a predetermined reference signal received power (RSRP) or more.
  • RSUs road side units
  • RSRP reference signal received power
  • the UE transmits the data on predetermined time-frequency resources of the resource pool.
  • the UE may select time-frequency resources from the resource pool and transmits the data.
  • a resource region is divided according to the traveling direction or mobility of a UE, it is possible to reduce ICI.
  • the BS is a terminal node of a network, which communicates directly with a UE.
  • a specific operation described as performed by the BS may be performed by an upper node of the BS.
  • a network comprised of a plurality of network nodes including a BS
  • various operations performed for communication with a UE may be performed by the BS or network nodes other than the BS.
  • the term 'BS' may be replaced with the term 'fixed station', 'Node B', 'evolved Node B (eNode B or eNB)', 'Access Point (AP)', etc.
  • the term 'relay' may be replaced with the term 'Relay Node (RN)' or 'Relay Station (RS)'.
  • the term 'terminal' may be replaced with the term 'UE', 'Mobile Station (MS)', 'Mobile Subscriber Station (MSS)', 'Subscriber Station (SS)', etc.
  • cell may be applied to transmission and reception points such as a base station (eNB), sector, remote radio head (RRH) and relay, and may also be extensively used by a specific transmission/reception point to distinguish between component carriers.
  • eNB base station
  • RRH remote radio head
  • the embodiments of the present invention can be supported by standard documents disclosed for at least one of wireless access systems, Institute of Electrical and Electronics Engineers (IEEE) 802, 3rd Generation Partnership Project (3GPP), 3GPP Long Term Evolution (3GPP LTE), LTE-Advanced (LTE-A), and 3GPP2. Steps or parts that are not described to clarify the technical features of the present invention can be supported by those documents. Further, all terms as set forth herein can be explained by the standard documents.
  • IEEE Institute of Electrical and Electronics Engineers
  • 3GPP 3rd Generation Partnership Project
  • 3GPP LTE 3GPP Long Term Evolution
  • LTE-A LTE-Advanced
  • 3GPP2 3rd Generation Partnership Project 2
  • Steps or parts that are not described to clarify the technical features of the present invention can be supported by those documents. Further, all terms as set forth herein can be explained by the standard documents.
  • CDMA Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • CDMA may be implemented as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented as a radio technology such as Global System for Mobile communications (GSM)/General Packet Radio Service (GPRS)/Enhanced Data Rates for GSM Evolution (EDGE).
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • OFDMA may be implemented as a radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved-UTRA (E-UTRA) etc.
  • UTRA is a part of Universal Mobile Telecommunications System (UMTS).
  • 3GPP LTE is a part of Evolved UMTS (E-UMTS) using E-UTRA.
  • 3GPP LTE employs OFDMA for downlink and SC-FDMA for uplink.
  • LTE-A is an evolution of 3GPP LTE.
  • WiMAX can be described by the IEEE 802.16e standard (Wireless Metropolitan Area Network (WirelessMAN)-OFDMA Reference System) and the IEEE 802.16m standard (WirelessMAN-OFDMA Advanced System). For clarity, this application focuses on the 3GPP LTE and LTE-A systems. However, the technical features of the present invention are not limited thereto.
  • uplink and/or downlink data Packets are transmitted in subframes.
  • One subframe is defined as a predetermined time period including a plurality of OFDM symbols.
  • the 3GPP LTE standard supports a type-1 radio frame structure applicable to Frequency Division Duplex (FDD) and a type-2 radio frame structure applicable to Time Division Duplex (TDD).
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • FIG. 1(a) illustrates the type-1 radio frame structure.
  • a downlink radio frame is divided into 10 subframes. Each subframe is further divided into two slots in the time domain.
  • a unit time during which one subframe is transmitted is defined as a Transmission Time Interval (TTI).
  • TTI Transmission Time Interval
  • one subframe may be 1ms in duration and one slot may be 0.5ms in duration.
  • a slot includes a plurality of OFDM symbols in the time domain and a plurality of Resource Blocks (RBs) in the frequency domain.
  • RBs Resource Blocks
  • an OFDM symbol represents one symbol period.
  • An OFDM symbol may be referred to as an SC-FDMA symbol or symbol period.
  • An RB is a resource allocation unit including a plurality of contiguous subcarriers in a slot.
  • the number of OFDM symbols in one slot may vary depending on a Cyclic Prefix (CP) configuration.
  • CP Cyclic Prefix
  • the normal CP one slot includes 7 OFDM symbols.
  • the extended CP the length of one OFDM symbol is increased and thus the number of OFDM symbols in a slot is smaller than in the case of the normal CP.
  • the extended CP for example, 6 OFDM symbols may be included in one slot.
  • the extended CP may be used to further decrease Inter-Symbol Interference (ISI).
  • ISI Inter-Symbol Interference
  • one subframe includes 14 OFDM symbols because one slot includes 7 OFDM symbols.
  • the first two or three OFDM symbols of each subframe may be allocated to a Physical Downlink Control CHannel (PDCCH) and the other OFDM symbols may be allocated to a Physical Downlink Shared Channel (PDSCH).
  • PDCCH Physical Downlink Control CHannel
  • PDSCH Physical Downlink Shared Channel
  • FIG. 1(b) illustrates the type-2 radio frame structure.
  • a type-2 radio frame includes two half frames, each having 5 subframes, a Downlink Pilot Time Slot (DwPTS), a Guard Period (GP), and an Uplink Pilot Time Slot (UpPTS). Each subframe is divided into two slots.
  • the DwPTS is used for initial cell search, synchronization, or channel estimation at a UE.
  • the UpPTS is used for channel estimation and acquisition of uplink transmission synchronization to a UE at an eNB.
  • the GP is a period between an uplink and a downlink, which eliminates uplink interference caused by multipath delay of a downlink signal.
  • One subframe includes two slots irrespective of the type of a radio frame.
  • radio frame structures are purely exemplary and thus it is to be noted that the number of subframes in a radio frame, the number of slots in a subframe, or the number of symbols in a slot may vary.
  • FIG. 2 illustrates the structure of a downlink resource grid for the duration of one downlink slot.
  • a downlink slot includes 7 OFDM symbols in the time domain and an RB includes 12 subcarriers in the frequency domain, which does not limit the scope and spirit of the present invention.
  • a downlink slot may include 7 OFDM symbols in the case of the normal CP, whereas a downlink slot may include 6 OFDM symbols in the case of the extended CP.
  • Each element of the resource grid is referred to as a Resource Element (RE).
  • An RB includes 12x7 REs.
  • the number of RBs in a downlink slot, NDL depends on a downlink transmission bandwidth.
  • An uplink slot may have the same structure as a downlink slot.
  • FIG. 3 illustrates the structure of a downlink subframe.
  • Up to three OFDM symbols at the start of the first slot in a downlink subframe are used for a control region to which control channels are allocated and the other OFDM symbols of the downlink subframe are used for a data region to which a PDSCH is allocated.
  • Downlink control channels used in the 3GPP LTE system include a Physical Control Format Indicator CHannel (PCFICH), a Physical Downlink Control CHannel (PDCCH), and a Physical Hybrid automatic repeat request (HARQ) Indicator CHannel (PHICH).
  • PCFICH Physical Control Format Indicator CHannel
  • PDCH Physical Downlink Control CHannel
  • HARQ Physical Hybrid automatic repeat request
  • PHICH Physical Hybrid automatic repeat request
  • the PHICH delivers an HARQ ACKnowledgment/Negative ACKnowledgment (ACK/NACK) signal in response to an uplink transmission.
  • Control information carried on the PDCCH is called Downlink Control Information (DCI).
  • DCI transports uplink or downlink scheduling information, or uplink transmission power control commands for UE groups.
  • the PDCCH delivers information about resource allocation and a transport format for a Downlink Shared CHannel (DL-SCH), resource allocation information about an Uplink Shared CHannel (UL-SCH), paging information of a Paging CHannel (PCH), system information on the DL-SCH, information about resource allocation for a higher-layer control message such as a Random Access Response transmitted on the PDSCH, a set of transmission power control commands for individual UEs of a UE group, transmission power control information, Voice Over Internet Protocol (VoIP) activation information, etc.
  • a plurality of PDCCHs may be transmitted in the control region.
  • a UE may monitor a plurality of PDCCHs.
  • a PDCCH is formed by aggregating one or more consecutive Control Channel Elements (CCEs).
  • a CCE is a logical allocation unit used to provide a PDCCH at a coding rate based on the state of a radio channel.
  • a CCE includes a plurality of RE groups.
  • the format of a PDCCH and the number of available bits for the PDCCH are determined according to the correlation between the number of CCEs and a coding rate provided by the CCEs.
  • An eNB determines the PDCCH format according to DCI transmitted to a UE and adds a Cyclic Redundancy Check (CRC) to control information.
  • the CRC is masked by an Identifier (ID) known as a Radio Network Temporary Identifier (RNTI) according to the owner or usage of the PDCCH.
  • ID Identifier
  • RNTI Radio Network Temporary Identifier
  • the PDCCH is directed to a specific UE, its CRC may be masked by a cell-RNTI (C-RNTI) of the UE. If the PDCCH is for a paging message, the CRC of the PDCCH may be masked by a Paging Indicator Identifier (P-RNTI). If the PDCCH carries system information, particularly, a System Information Block (SIB), its CRC may be masked by a system information ID and a System Information RNTI (SI-RNTI). To indicate that the PDCCH carries a Random Access Response in response to a Random Access Preamble transmitted by a UE, its CRC may be masked by a Random Access-RNTI (RA-RNTI).
  • SIB System Information Block
  • SI-RNTI System Information RNTI
  • RA-RNTI Random Access-RNTI
  • FIG. 4 illustrates the structure of an uplink subframe.
  • An uplink subframe may be divided into a control region and a data region in the frequency domain.
  • a Physical Uplink Control CHannel (PUCCH) carrying uplink control information is allocated to the control region and a Physical Uplink Shared Channel (PUSCH) carrying user data is allocated to the data region.
  • PUCCH Physical Uplink Control CHannel
  • PUSCH Physical Uplink Shared Channel
  • a UE does not transmit a PUSCH and a PUCCH simultaneously.
  • a PUCCH for a UE is allocated to an RB pair in a subframe. The RBs of the RB pair occupy different subcarriers in two slots. Thus it is said that the RB pair allocated to the PUCCH is frequency-hopped over a slot boundary.
  • RSs Reference Signals
  • a Packet is transmitted on a radio channel.
  • the Packet may be distorted during the transmission.
  • a receiver should compensate for the distortion of the received signal using channel information.
  • a transmitter transmits a signal known to both the transmitter and the receiver and the receiver acquires knowledge of channel information based on the distortion of the signal received on the radio channel. This signal is called a pilot signal or an RS.
  • Tx Transmission
  • Rx Reception
  • the RSs may be divided into downlink RSs and uplink RSs.
  • the uplink RSs include:
  • the downlink RSs are categorized into:
  • RSs may also be divided into two types according to their purposes: RS for channel information acquisition and RS for data demodulation. Since its purpose lies in that a UE acquires downlink channel information, the former should be transmitted in a broad band and received even by a UE that does not receive downlink data in a specific subframe. This RS is also used in a situation like handover. The latter is an RS that an eNB transmits along with downlink data in specific resources. A UE can demodulate the data by measuring a channel using the RS. This RS should be transmitted in a data transmission area.
  • FIG. 5 is a diagram illustrating a configuration of a wireless communication system having multiple antennas.
  • the transfer rate may be theoretically increased by a product of a maximum transfer rate Ro upon utilization of a single antenna and a rate increase ratio Ri.
  • transmit powers can be set different from each other for individual pieces of transmission information S 1 , S 2 , ⁇ , S N T , respectively. If the transmit powers are set to P 1 , P 2 , ⁇ , P N T , respectively, the transmission information with adjusted transmit powers can be represented as Equation 3.
  • ⁇ can be represented as Equation 4 using diagonal matrix P of the transmission power.
  • s ⁇ P 1 0 P 2 ⁇ 0 P N T
  • s 1 s 2 ⁇ s N T Ps
  • x 1 , x 2 , ⁇ , x N T can be expressed by using the vector X as follows.
  • W ij denotes a weight between an i th transmit antenna and j th information. W is also called a precoding matrix.
  • channels are modeled in the MIMO wireless communication system, the channels may be distinguished according to transmit/receive antenna indexes.
  • a channel from the transmit antenna j to the receive antenna i is denoted by h ij .
  • h ij it is noted that the indexes of the receive antennas precede the indexes of the transmit antennas in view of the order of indexes.
  • FIG. 5(b) is a diagram illustrating channels from the NT transmit antennas to the receive antenna i.
  • the channels may be combined and expressed in the form of a vector and a matrix.
  • AWGN Additional White Gaussian Noise
  • the received signals can be expressed as follows.
  • the number of rows and columns of the channel matrix H indicating the channel state is determined by the number of transmit and receive antennas.
  • the number of rows of the channel matrix H is equal to the number NR of receive antennas and the number of columns thereof is equal to the number NR of transmit antennas. That is, the channel matrix H is an NR ⁇ NT matrix.
  • the rank of the matrix is defined by the smaller of the number of rows and the number of columns, which are independent from each other. Accordingly, the rank of the matrix is not greater than the number of rows or columns.
  • the rank rank ( H ) of the channel matrix H is restricted as follows. rank H ⁇ min N T , N R
  • the rank of a matrix can also be defined as the number of non-zero Eigen values when the matrix is Eigen-value-decomposed.
  • the rank of a matrix can be defined as the number of non-zero singular values when the matrix is singular-value-decomposed.
  • the physical meaning of the rank of a channel matrix can be the maximum number of channels through which different pieces of information can be transmitted.
  • 'rank' for MIMO transmission indicates the number of paths capable of sending signals independently on specific time and frequency resources and 'number of layers' indicates the number of signal streams transmitted through the respective paths.
  • a transmitting end transmits the number of layers corresponding to the rank number, one rank has the same meaning of the layer number unless mentioned specially.
  • some nodes may transmit a D2D Synchronization Signal (D2DSS) and the remaining UEs may transmit and receive signals in synchronization with the D2DSS.
  • D2DSS D2D Synchronization Signal
  • D2DSSs may include a Primary D2DSS (PD2DSS) or a Primary Sidelink Synchronization Signal (PSSS) and a Secondary D2DSS (SD2DSS) or a Secondary Sidelink Synchronization Signal (SSSS).
  • the PD2DSS may be configured to have a similar/modified/repeated structure of a Zadoff-chu sequence of a predetermined length or a Primary Synchronization Signal (PSS).
  • PSS Primary Synchronization Signal
  • the PD2DSS may use a different Zadoff-chu root index (e.g., 26, 37).
  • the SD2DSS may be configured to have a similar/modified/repeated structure of an M-sequence or a Secondary Synchronization Signal (SSS).
  • SSS Secondary Synchronization Signal
  • the eNB serves as an SRN and the D2DSS is a PSS/SSS.
  • the PD2DSS/SD2DSS follows UL subcarrier mapping scheme.
  • FIG. 6 shows a subframe in which a D2D synchronization signal is transmitted.
  • a Physical D2D Synchronization Channel may be a (broadcast) channel carrying basic (system) information that a UE should first obtain before D2D signal transmission and reception (e.g., D2DSS-related information, a Duplex Mode (DM), a TDD UL/DL configuration, a resource pool-related information, the type of an application related to the D2DSS, etc.).
  • the PD2DSCH may be transmitted in the same subframe as the D2DSS or in a subframe subsequent to the frame carrying the D2DSS.
  • a DMRS can be used to demodulate the PD2DSCH.
  • the SRN may be a node that transmits a D2DSS and a PD2DSCH.
  • the D2DSS may be a specific sequence and the PD2DSCH may be a sequence representing specific information or a codeword produced by predetermined channel coding.
  • the SRN may be an eNB or a specific D2D UE. In the case of partial network coverage or out of network coverage, the SRN may be a UE.
  • a D2DSS may be relayed for D2D communication with an out-of-coverage UE.
  • the D2DSS may be relayed over multiple hops.
  • relay of an SS covers transmission of a D2DSS in a separate format according to a SS reception time as well as direct Amplify-and-Forward (AF)-relay of an SS transmitted by an eNB.
  • AF direct Amplify-and-Forward
  • an in-coverage UE may communicate directly with an out-of-coverage UE.
  • FIG. 8 shows an example of a UE1, a UE2 and a resource pool used by the UE1 and the UE2 performing D2D communication.
  • a UE corresponds to a terminal or such a network device as an eNB transmitting and receiving a signal according to a D2D communication scheme.
  • a UE selects a resource unit corresponding to a specific resource from a resource pool corresponding to a set of resources and the UE transmits a D2D signal using the selected resource unit.
  • a UE2 corresponding to a reception UE receives a configuration of a resource pool in which the UE1 is able to transmit a signal and detects a signal of the UE1 in the resource pool.
  • a resource pool includes a plurality of resource units.
  • a UE selects one or more resource units from among a plurality of the resource units and may be able to use the selected resource unit(s) for D2D signal transmission.
  • FIG. 8 (b) shows an example of configuring a resource unit. Referring to FIG.
  • a resource pool can be repeated with a period of N T subframes.
  • one resource unit may periodically and repeatedly appear.
  • an index of a physical resource unit to which a logical resource unit is mapped may change with a predetermined pattern according to time to obtain a diversity gain in time domain and/or frequency domain.
  • a resource pool may correspond to a set of resource units capable of being used by a UE intending to transmit a D2D signal.
  • a resource pool can be classified into various types. First of all, the resource pool can be classified according to contents of a D2D signal transmitted via each resource pool. For example, the contents of the D2D signal can be classified into various signals and a separate resource pool can be configured according to each of the contents.
  • the contents of the D2D signal may include SA (scheduling assignment), a D2D data channel, and a discovery channel.
  • the SA may correspond to a signal including information on a resource position of a D2D data channel, information on MCS (modulation and coding scheme) necessary for modulating and demodulating a data channel, information on a MIMO transmission scheme, information on TA (timing advance), and the like.
  • the SA signal can be transmitted on an identical resource unit in a manner of being multiplexed with D2D data.
  • an SA resource pool may correspond to a pool of resources that an SA and D2D data are transmitted in a manner of being multiplexed.
  • the SA signal can also be referred to as a D2D control channel or a PSCCH (physical sidelink control channel).
  • the D2D data channel (or, PSSCH (physical sidelink shared channel)) corresponds to a resource pool used by a transmission UE to transmit user data. If an SA and a D2D data are transmitted in a manner of being multiplexed in an identical resource unit, D2D data channel except SA information can be transmitted only in a resource pool for the D2D data channel.
  • resource elements which are used to transmit SA information in a specific resource unit of an SA resource pool, can also be used for transmitting D2D data in a D2D data channel resource pool.
  • the discovery channel may correspond to a resource pool for a message that enables a neighboring UE to discover transmission UE transmitting information such as ID of the UE, and the like.
  • contents of D2D signal are identical to each other, it may use a different resource pool according to a transmission/reception attribute of the D2D signal.
  • the D2D data channel or the discovery signal can be classified into a different resource pool according to a transmission timing determination scheme (e.g., whether a D2D signal is transmitted at the time of receiving a synchronization reference signal or the timing to which a prescribed timing advance is added) of a D2D signal, a resource allocation scheme (e.g., whether a transmission resource of an individual signal is designated by an eNB or an individual transmission UE selects an individual signal transmission resource from a pool), a signal format (e.g., number of symbols occupied by a D2D signal in a subframe, number of subframes used for transmitting a D2D signal), signal strength from an eNB, strength of transmit power of a D2D UE, and the like.
  • a transmission timing determination scheme e.g., whether a D2D signal is transmitted at the time of
  • a method for an eNB to directly designate a transmission resource of a D2D transmission UE is referred to as a mode 1. If a transmission resource region is configured in advance or an eNB designates the transmission resource region and a UE directly selects a transmission resource from the transmission resource region, it is referred to as a mode 2. In case of performing D2D discovery, if an eNB directly indicates a resource, it is referred to as a type 2. If a UE directly selects a transmission resource from a predetermined resource region or a resource region indicated by the eNB, it is referred to as a type 1.
  • a mode 1 UE can transmit an SA signal (or, a D2D control signal, SCI (sidelink control information)) via a resource configured by an eNB.
  • a mode 2 UE receives a configured resource to be used for D2D transmission.
  • the mode 2 UE can transmit SA by selecting a time frequency resource from the configured resource.
  • the SA period can be defined as FIG. 9 .
  • a first SA period can start at a subframe apart from a specific system frame as much as a prescribed offset (SAOffsetIndicator) indicated by higher layer signaling.
  • Each SA period can include an SA resource pool and a subframe pool for transmitting D2D data.
  • the SA resource pool can include subframes ranging from a first subframe of an SA period to the last subframe among subframes indicated by a subframe bitmap (saSubframeBitmap) to transmit SA.
  • T-RPT time-resource pattern for transmission
  • T-RPT time-resource pattern for transmission
  • SA may indicate the transmission position of data in the form of T-RPT or using another explicit method. For example, a transmission start position of data, the number of repetitions, etc. may be indicated. More generally, SA is a transmission channel indicating time and frequency positions of transmission resources of data and including supplementary information necessary for data decoding. Such an SA resource pool may be separated from a data pool or may partially overlap a data pool to partially share a data domain. In addition, the data pool and the SA resource pool may not be separated in the time domain but may be separated in the frequency domain.
  • V2X communication has been discussed in association with D2D communication.
  • V2X may include V2V between vehicle UEs, V2P between a vehicle and another type of UE, and V2I between a vehicle and a roadside unit (RSU).
  • RSU roadside unit
  • a UE may be a vehicle or a UE attached to a vehicle.
  • a UE may select a resource pool by comparing one or more measurement information with resource pool parameters and transmit data using the resource pool.
  • the UE may transmit data on predetermined time-frequency resources of the resource pool or select time-frequency resources from the resource pool to transmit data.
  • one or more measurement information may be related to a geographical position of the UE.
  • the UE may select a resource pool from among a plurality of resource pools, and, in the resource pools, the range of a value may be configured according to parameters related to the geographical position of the UE.
  • the UE may compare the measurement information related to the geographical position with the range of the parameter values configured in the resource pool and select a resource pool suiting a condition.
  • one or more of a transmission period, a transmission probability and a repetition number may be configured. In this case, when the UE selects a specific resource pool, transmission may be performed according to the transmission period, the transmission probability and the repetition number configured in the resource pool.
  • the transmission period, the transmission probability and the repetition number may be forcibly set or recommended (selected by the UE) to the UE upon selecting the resource pool.
  • one or more measurement information may include movement direction information of the UE.
  • the resource pool may be preconfigured according to movement directions. For example, in a road environment shown in FIG. 10 , since the movement direction information of the UE is of two types, at least two types of resource pools may be configured according to direction. In addition, a threshold of a heading value may be configured in the resource pool. If the number of resource pools per direction is 1, as shown in FIG. 10 , UEs having the same movement direction (that is, UEs traveling in the same direction) may use the same resource (resource pool A) and UEs traveling in a different direction may use a different resource pool B.
  • the resource pools are divided on a time axis in the example of FIG. 10 , this is merely an example and the resource pools may be divided on a frequency axis or a time-frequency axis.
  • the movement direction information of the UE may be measured by a sensor or a global positioning system (GPS) of the UE.
  • the method of acquiring/measuring the movement direction information is not limited thereto and various methods capable of obtaining a heading value may be used. That is, if the movement direction of the UE is checked using any method, a resource region is divided and used by UEs having different movement directions using the value of the movement direction. At this time, resources may be divided using three methods, that is, according to time, frequency or time/frequency. The embodiment of the present invention may include the three methods.
  • the heading value may be implicitly checked by tracking the ID of an RSU or a peripheral cell. That is, the movement direction information of the UE may be derived from change in cell ID.
  • a cell ID may be identifier information for identifying a road side unit (RSU).
  • RSU road side unit
  • a network may configure change in cell ID or a change range of a sequence or vector generated by change in cell ID or equivalent information thereof when the UE moves, according to resource pool.
  • resource pool used by a UE, a cell ID of which is changed in order of A, B and C in a specific region and a resource pool used by a UE, a cell ID of which is changed in order of C, B and A, may be distinguished/divided.
  • a network may configure a cell ID change value, a difference, a range of a vector value between cell IDs, etc.
  • the network may configure the order of detected cell IDs having a predetermined threshold or more within a predetermined period according to resource pool.
  • a UE may track the ID of the detected RSU to estimate mobility and direction of the UE.
  • the network may signal change in ID of the RSU according to resource pool.
  • a UE moving on a specific road may report the order of the detected cell IDs or the order of RSU IDs to the network through a physical layer signal or a higher layer signal along with (or separately from) a heading value or the direction of the road, in order to estimate cell ID/RSU ID change statistics according to heading value on the specific road.
  • the network may configure the change value of the cell ID/RSU ID per resource pool based on information fed back from the UE.
  • the heading value or range may be directly configured per resource pool or several resource pools may be configured and the usage index of the resource pool according to heading may be configured by the network.
  • a method of, at a UE, selecting a usage index according to heading value and selecting a resource pool according to the usage index selected by the UE is proposed.
  • the heading value is not explicitly used to select the resource pool but is replaced by the usage index per resource pool to implicitly divide resource pools according to the heading value.
  • the relative speeds of the UEs may decrease, thus decreasing inter carrier interference (ICI).
  • ICI inter carrier interference
  • a necessary service may be changed depending on whether the movement directions are the same or different. For example, on a road in which information about an opposite lane is not important, such as a guardrail or tunnel, decoding of information transmitted by a UE in the opposite lane may be omitted.
  • a traffic jam may occur in a specific direction or when the number of UEs may rapidly increases due to traffic jam in an opposite lane. Such a problem may be solved. If a shared pool is used regardless of direction, D2D signal transmission and reception in a specific direction may not be smoothly performed due to traffic jam in an opposite lane.
  • one or more measurement information may include mobility of a UE. That is, the resource pool may be divided according to mobility of the UE.
  • a network may configure an upper or lower limit or average of mobility according to resource pool. That is, the UE may check mobility thereof and transmit a signal only in a resource pool satisfying a mobility condition configured by the network.
  • a resource region may be divided between a UE having low mobility and a UE having high mobility, thereby preventing the UE having low mobility from experiencing ICI from the UE having high mobility.
  • Mobility may be measured by the speed sensor of the UE. If a vehicle and a wireless UE are linked, a resource region in which the wireless UE of the vehicle transmits a signal may be selected using information acquired by the speed sensor of the vehicle. More specifically, a network or a UE knows positions of RSUs, an interval between the RSUs, an average distance between the RSUs on a road or density of RSUs or a network knows and signals the information to the UE through a physical layer signal or a higher layer signal. The UE may count the number of RSUs having a predetermined reference signal received power (RSRP) or more per time or the number of times of handover based on the information to estimate an average speed and divide and use a resource region according to mobility.
  • RSRP reference signal received power
  • mobility may be determined according to the number of RSUs having the predetermined RSRP or more.
  • the average distance between RSUs or the positions of the RSUs may be signaled to the UE through a physical layer signal or a higher layer signal.
  • mobility may be checked by counting the average number of times of handover of the UE.
  • resource pools may be differently set according to a lane in which a UE travels. For example, if four lanes are present and a left-turn signal and a left-turn lane are present, a relative speed may be decreased before signal change.
  • a signal transmitted by a vehicle traveling in the specific lane may be transmitted in a separate resource pool, differently from a signal transmitted by vehicles traveling in the other lane.
  • Such lane information may be acquired by the UE using position estimation technology or the lane of the UE may be checked by the network through network-based position estimation technology and signaled to the UE.
  • a vehicle traveling in a specific lane may transmit or receive a signal in a resource region configured for the specific lane.
  • FIG. 11 shows an example in which a first lane is set as a public transportation only lane. Referring to FIG. 11 , a resource region in which vehicles traveling in the first lane transmit and receive signals and a resource region in which vehicles traveling in the other lanes transmit and receive signals may be divided, because the average speed of the vehicle traveling in the first lane and the average speed of the vehicle traveling in the other lane may be different.
  • mobility increasing or decreasing in communication between vehicles may mean that a traffic jam occurs in the lane or on the road.
  • a traffic jam occurs in the lane or on the road.
  • a transmission period may be increased.
  • a transmission probability and a repetition number may be adjusted according to mobility of the UE. For example, the transmission period, the transmission probability and the repetition number may increase when the speed of the UE increases and decrease when the speed of the UE decreases.
  • signals are transmitted and received at an interval of N ms.
  • the movement speed of the UE is in a range of A km/h to B km/h and signals are configured to be transmitted in a resource region at a period of N ms
  • N1 2*N
  • the transmission period of the signal may be increased to reduce contention.
  • a signal transmission probability may be adjusted using other methods. For example, if the movement speed of the UE is equal to or less than a predetermined threshold, the transmission probability may be decreased to reduce contention.
  • a vehicle may include multiple antennas mounted therein.
  • antennas are mounted in left and right doors and an antenna having a protruding shape (having a shark-fin shape) may be formed on the roof of a vehicle.
  • the properties of the wireless channel may be remarkably changed according to the position of the antenna of the vehicle.
  • the channel properties of the antennas mounted in the left and right doors may be remarkably different from those of other vehicles or other UEs.
  • the antenna formed on the roof of the vehicle is used to perform communication with infrastructure and the antennas mounted in the doors may be used for high-speed communication between vehicles traveling in the same direction such as measurement of a distance from another vehicle or lane level positioning.
  • a separate resource region (time or frequency) may be used according to usage of the antenna.
  • a UE ID may be assigned according to antenna or usage of the antenna to regard a vehicle as having a plurality of UEs mounted therein.
  • a rule for assigning a usage index to each UE and using a separate resource region according to the usage index may be set.
  • all or some of the proposed methods may be used for direct link between UEs, such as D2D or V2V or may be used when UEs transmit signals to fixed infrastructure (an eNB or an RSU) (UL or DL), such as V2I.
  • UEs such as D2D or V2V
  • UL or DL fixed infrastructure
  • V2I V2I
  • ICI is generated between the UEs and implementation of an eNB for detecting each packet may become complicated.
  • a common mobility component may be predicted in the resource region such that the eNB applies a common filter in the resource region, thereby improving performance or decreasing detection complexity.
  • methods of applying more random beamforming to transmission in the region or applying pre-distortion in order to attenuate a common Doppler component may be considered.
  • the movement speed may be the movement speed of a UE or an average of the movement speeds of UEs located near the UE.
  • transmission parameters all or some of a transmission period, a probability, a repetition number, transmit power, a channel (energy or reference signal) sensing threshold and channel occupancy time window adaptation
  • the UE cannot recognize whether the transmission parameters are adjusted due to congestion or whether a driver decreases the speed of the vehicle regardless of congestion, when adjusting the transmission parameters using the speed thereof.
  • a network or an RSU may signal a transmission determination value according to the average movement or movement speeds of neighboring UEs or the UE may average the movement speeds of the neighboring UEs and determine the transmission parameters.
  • a movement speed may be included in a physical layer signal or a higher layer signal and a field indicating the transmission parameter according to the movement speed of the UE may be included in the physical layer signal or the higher layer signal.
  • the UE of the vehicle may determine the transmission parameters in consideration of the messages received from the neighboring UEs and the movement speed thereof.
  • a rule may be defined such that an eNB signals information regarding whether the proposed methods are applied (information regarding the rules of the above-proposed methods) to a UE through a predefined signal (e.g., a physical layer signal or a higher layer signal).
  • a predefined signal e.g., a physical layer signal or a higher layer signal.
  • FIG. 13 is a diagram showing the configuration of a transmission point device and a UE device.
  • the transmission point device 10 may include a reception module 11, a transmission module 12, a processor 13, a memory 14 and a plurality of antennas 15. Since the plurality of antennas 15 is used, the transmission point device may support MIMO transmission/reception.
  • the reception module 11 may receive a variety of signals, data and information from the UE on uplink.
  • the transmission module 12 may transmit a variety of signals, data and information to the UE on downlink.
  • the processor 13 may control the overall operation of the transmission point device 10.
  • the processor 13 of the transmission point device 10 may process operations necessary for the above-described embodiments.
  • the processor 13 of the transmission point device 10 may process information received by the transmission point device 10 and information to be transmitted to an external device and the memory 14 may store the processed information for a predetermined time and may be replaced by a component such as a buffer (not shown).
  • the UE device 20 may include a reception module 21, a transmission module 22, a processor 23, a memory 24 and a plurality of antennas 25. Since the plurality of antennas 25 is used, the UE device may support MIMO transmission/reception.
  • the reception module 25 may receive a variety of signals, data and information from the eNB on downlink.
  • the transmission module 22 may transmit a variety of signals, data and information to the eNB on uplink.
  • the processor 23 may control the overall operation of the UE device 20.
  • the processor 23 of the UE device 20 may process operations necessary for the above-described embodiments.
  • the processor 23 of the UE device 20 may process information received by the UE device 20 and information to be transmitted to an external device and the memory 24 may store the processed information for a predetermined time and may be replaced by a component such as a buffer (not shown).
  • the description of the transmission point device 10 may also be equally applied to a device functioning as a downlink transmitter or an uplink receiver.
  • the description of the UE device 20 may also be equally applied to a relay station device functioning as an uplink transmitter or a downlink receiver.
  • the embodiments of the present invention can be implemented by a variety of means, for example, hardware, firmware, software, or a combination thereof.
  • the present invention can be implemented with application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), a processor, a controller, a microcontroller, a microprocessor, etc.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • processor a controller, a microcontroller, a microprocessor, etc.
  • the present invention can be implemented in the form of a variety of formats, for example, modules, procedures, functions, etc.
  • Software code may be stored in a memory unit so as to be driven by a processor.
  • the memory unit is located inside or outside of the processor, so that it can communicate with the aforementioned processor via a variety of well-known parts.

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EP16773496.1A 2015-04-01 2016-04-01 Procédé et dispositif d'émission, à l'aide d'un terminal v2x, d'un signal dans un système de communication sans fil Active EP3280172B1 (fr)

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CN107439036B (zh) 2021-12-03
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JP2018513626A (ja) 2018-05-24
US20180115970A1 (en) 2018-04-26
JP6501905B2 (ja) 2019-04-17
KR20170138458A (ko) 2017-12-15
WO2016159715A3 (fr) 2016-11-24
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EP3280172B1 (fr) 2024-05-29
CN107439036A (zh) 2017-12-05

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